Alibaba Fastjson up to 1.2.47 inclusion of functionality from untrusted control sphere

Summaryinfo

A vulnerability classified as critical was found in Alibaba Fastjson up to 1.2.47. Affected by this issue is some unknown functionality. The manipulation results in inclusion of functionality from untrusted control sphere. This vulnerability is reported as CVE-2025-70974. The attack can be launched remotely. Moreover, an exploit is present. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Alibaba Fastjson up to 1.2.47. It has been classified as critical. Affected is an unknown function. The manipulation with an unknown input leads to a inclusion of functionality from untrusted control sphere vulnerability. CWE is classifying the issue as CWE-829. The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Fastjson before 1.2.48 mishandles autoType because, when an @type key is in a JSON document, and the value of that key is the name of a Java class, there may be calls to certain public methods of that class. Depending on the behavior of those methods, there may be JNDI injection with an attacker-supplied payload located elsewhere in that JSON document. This was exploited in the wild in 2023 through 2025. NOTE: this issue exists because of an incomplete fix for CVE-2017-18349. Also, a later bypass is covered by CVE-2022-25845.

The advisory is available at github.com. This vulnerability is traded as CVE-2025-70974 since 01/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are unknown but a public exploit is available.

The exploit is shared for download at cloudsek.com. It is declared as attacked.

Upgrading to version 1.2.48 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-1694). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Alibaba

Name

• Fastjson

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6
• 1.2.7
• 1.2.8
• 1.2.9
• 1.2.10
• 1.2.11
• 1.2.12
• 1.2.13
• 1.2.14
• 1.2.15
• 1.2.16
• 1.2.17
• 1.2.18
• 1.2.19
• 1.2.20
• 1.2.21
• 1.2.22
• 1.2.23
• 1.2.24
• 1.2.25
• 1.2.26
• 1.2.27
• 1.2.28
• 1.2.29
• 1.2.30
• 1.2.31
• 1.2.32
• 1.2.33
• 1.2.34
• 1.2.35
• 1.2.36
• 1.2.37
• 1.2.38
• 1.2.39
• 1.2.40
• 1.2.41
• 1.2.42
• 1.2.43
• 1.2.44
• 1.2.45
• 1.2.46
• 1.2.47

Website

• Product: https://github.com/alibaba/fastjson/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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